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CVE-2026-22872— Capsule TenantResource RawItems Cluster-Scoped Resource Creation Vulnerability

Quick assessment

Affected
projectcapsule capsule
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Capsule是Project Capsule开源的一个 Kubernetes 的多租户和基于策略的框架。 Capsule 0.13.0之前版本存在安全漏洞，该漏洞源于TenantResource RawItems处理逻辑未对集群范围资源设置命名空间，可能导致租户管理员利用控制器特权创建集群范围资源，实现跨租户权限提升和集群级攻击。

AI Predicted 8.1 Difficulty: Easy EPSS 0.68% · P51

Affected Version Matrix 1

VendorProduct Version RangeStatus
projectcapsule capsule < 0.13.0 affected
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I. Basic Information for CVE-2026-22872

Vulnerability Information
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Vulnerability Title
Capsule TenantResource RawItems Cluster-Scoped Resource Creation Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Capsule is a multi-tenancy and policy-based framework for Kubernetes. The Capsule Controller runs with cluster-admin privileges. Although the TenantResource RawItems processing logic forcibly sets the namespace, this is ineffective for cluster-scoped resources. Prior to version 0.13.0, tenant administrators can leverage the Controller's elevated privileges to create cluster-scoped resources (such as ClusterRole and ValidatingWebhookConfiguration) that they cannot create directly, achieving cross-tenant privilege escalation and cluster-level attacks. The attack vector has a few limiting factors. This attack requires Tenant Owner privileges and requires Capsule Controller running with cluster-admin privileges (default configuration). Additionally, some clusters may have additional admission controllers blocking malicious resources. Version 0.13.0 patches this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Capsule 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Capsule是Project Capsule开源的一个 Kubernetes 的多租户和基于策略的框架。 Capsule 0.13.0之前版本存在安全漏洞，该漏洞源于TenantResource RawItems处理逻辑未对集群范围资源设置命名空间，可能导致租户管理员利用控制器特权创建集群范围资源，实现跨租户权限提升和集群级攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
projectcapsule capsule < 0.13.0 -

II. Public POCs for CVE-2026-22872

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III. Intelligence Information for CVE-2026-22872

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Vendor Advisories for CVE-2026-22872 (1)

Vendor Pages for CVE-2026-22872 (1)

IV. Related Vulnerabilities

Same product: capsule
Same vendor: projectcapsule
Same weakness: CWE-20

V. Comments for CVE-2026-22872

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